Any of the newer Luxman integrated amplifiers will work and sound great.
I have the JBL 4319 monitors and I'm using a Luxman 590 AXII integrated which is 30 watts of class A and the room is 42' x 14' with an 8' ceiling. I have no problem at all getting all the volume I want. Luxman has several models available class AB that put out 100 watts or more per channel.
509X
507 UXII
507UX
550 AXII
505 UXII
Within your price range, some new, some used.
I have the JBL 4319 monitors and I'm using a Luxman 590 AXII integrated which is 30 watts of class A and the room is 42' x 14' with an 8' ceiling. I have no problem at all getting all the volume I want. Luxman has several models available class AB that put out 100 watts or more per channel.
509X
507 UXII
507UX
550 AXII
505 UXII
Within your price range, some new, some used.